common file/path related method

String+Z.swift

//
//  String+Z.swift
//  ZKit
//
//  Created by Kaz Yoshikawa on 11/10/15.
//
//

import Foundation


extension String {

	func stringByAppendingPathExtension(str: String) -> String? {
		return (self as NSString).stringByAppendingPathExtension(str)
	}
	
	func stringByAppendingPathComponent(str: String) -> String {
		return (self as NSString).stringByAppendingPathComponent(str)
	}
	
	var stringByDeletingPathExtension: String {
		return (self as NSString).stringByDeletingPathExtension
	}

	var stringByDeletingLastPathComponent: String {
		return (self as NSString).stringByDeletingLastPathComponent
	}

	var lastPathComponent: String {
		return (self as NSString).lastPathComponent
	}

	var pathExtension: String {
		return (self as NSString).pathExtension
	}

	var pathComponents: [String] {
		return (self as NSString).pathComponents
	}

	func pathsForResourcesOfType(type: String) -> [String] {
		let enumerator = NSFileManager.defaultManager().enumeratorAtPath(self)
		var filePaths = [String]()
		while let filePath = enumerator?.nextObject() as? String {
			if filePath.pathExtension == type {
				filePaths.append(filePath)
			}
		}
		return filePaths
	}

	var lines: [String] {
		var lines = [String]()
		self.enumerateLines { (line, stop) -> () in
			lines.append(line)
		}
		return lines
	}

	func indent() -> String {
		return self.lines.map{"  " + $0}.joinWithSeparator("\r")
	}

}